IS 4332-9: Methods of test for stabilized soils, Part 9: Determination of the bituminous stabilizer content of bitumen and tar stabilized soils

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IS 4332-9 (1970) : Methods of test for stabilized soils,
Part 9: Determination of the bituminous stabilizer content
of bitumen and tar stabilized soils [CED 43: Soil and
Foundation Engineering]

Satyanarayan Gangaram Pitroda
Invent a New India Using Knowledge

Bhartrhari — Nitisatakam
"Knowledge is such a treasure which cannot be stolen"

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IS: 4332 (Part IX) -1970

( Reaffirmed 2006 )

Edition 1.1
(1983-06)

Incdian Stancdarcd

METHODS OF TEST FOR STABILIZED SOILS

PART IX DETERMINATION OF THE BITUMINOUS

STABILIZER CONTENT OF BITUMEN AND

TAR STABILIZED SOILS

(Incorporating Amendment No. 1)

UDC 624.138.232.2

©BIS 2004

BUREAU OF INDIAN STANDARDS

MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

Price Group 4

IS: 4332 (Part IX) -1970

Indian Standard

METHODS OF TEST FOR STABI LIZED SOI LS

PART IX DETERMINATION OF THE BITUMINOUS

STABILIZER CONTENT OF BITUMEN AND

TAR STABILIZED SOILS

Soil Engineering Sectional Committee, BDC 23

Chairman

Prof s. R. Mehra

Manak, Old Adhikari Lodge,

Ranikhet, Uttar Pradesh

Members Representing

Dr Alam Singh University of J odhpur, J odhpur

Shri B. B. L. Bhatnagar Land Reclamation, Irrigation & Power Research

Institute, Amritsar
Shri K. N. Dadina In personal capacity ( P-820, New Alipore,

Calcutta 53)
Shri A. G. Dastidar Cementation Co Ltd, Bombay

Shri J . Datt Concrete Association of India, Bombay

Shri T. M. Menon (Alternate)
Shri R. L. Dewan Bihar Institute of Hydraulic and Allied Research,

Khagaul, Patna
Prof Dinesh Mohan Central Building Research Institute(CSIR), Roorkee

Shri D. R. Narahari (Alternate)
Director, Central Soil Mecha- Central Water & Power Commission, New Delhi
NIGS Research Station
Director (Dams II) (Alternate)
Prof R. N. Dogra Indian Institute of Technology, New Delhi

Shri B. N. Gupta Irrigation Research Institute, Roorkee

DrJagdish Narain U niversity of Roorkee, Roorkee

Shri P. C.J ain National Buildings Organisation, New Delhi

Shri B. S. Bhatti (Alternate)
J oiNT Director, Research (FE), Railway Board (Ministry of Railways)
RDSO
Deputy Director Research

Soil, Mechanics, RDSO (Alternate)
Shri S. S.J oshi Engineer-in-Chief's Branch, Army Headquarters

Shri S. Varadaraja (Alternate)
Shri G. Kueckelmann Radio Foundation Engineering Ltd; and Hazarat &

Co, Bombay
Shri A. H. Divanj i (Alternate)
Shri O. P. Malhotra Public Works Department, Government of Punjab

Shri C. B. Patel M.N. Dastur& Co (Private) Ltd, Calcutta

( Continued on page 2 )

BUREAU OF INDIAN STANDARDS

MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

IS: 4332 (Part IX) -1970

( Continued from pagel )

Members
Representative

Representative

Representative

Research Officer

Research Officer
Secretary
Shri S. N. Sinha

Shri a. S. Bishnoi ( Alternate
Superintending Engineer
(Planning & Design Circle)
Executive Engineer (Soil
Mechanics & Research
Division) (Alternate)
Shri C. G. Swaminathan
Dr H. L. Uppal
Shri H. G. Verma

Representing

All India Instruments Manufacturers & Dealers
Association, Bombay

Indian National Society of Soil Mechanics & Founda-
tion Engineering, New Delhi

Public Worl<s Directorate (Special Roads),
Government of West Bengal

Building and Roads Research Laboratory, Public
Worl<s Department, Government of Punjab

Engineering Research Department, Hyderabad

Central Board of Irrigation and Power, New Delhi

Roads Wing (Ministry of Transport & Shipping)

)

Concrete and Soil Research Laboratory, Public Works
Department, Government of Tamil Nadu

Institution of Engineers (India), Calcutta
Central Road Research Institute (CSIR), New Delhi
Public Works Department, Government of Uttar
Pradesh
Shri D. C. Chaturvedi (Alternate)

Shri R. Nagaraj an.
Director (Civ Engg)

Director General, ISI ( Ex-offi do Member ]

Secretary

Shri G. Raman

Deputy Director (Civ Engg), ISI

Soil Testing Procedures and Equipment Subcommittee, BDC 23

Central Road Research Institute (CSIR), New Delhi

Convener
Dr H. L. Uppal

Members
DrAlam Singh University of J odhpur, J odhpur

Shri T. N. Bhargava Roads Wing (Ministry of Transport & Shipping)

Shri A. S. Bishnoi (Alternate)
Shri R.L.Dewan Bihar Institute of Hydraulic and Allied Research,

Khagaul, Patna
Director (Central Soil Mecha- Central Water & Power Commission, New Delhi
Nics & Research Station)
Director (Dams II) (Alternate)
Shri H.K.Guha Geologists Syndicate Private Ltd, Calcutta

Shri N. N. Bhattacharyya (Alternate)

Shri S. S.J oshi
Shri Mahabir Prasad

Shri O. P. Malhotra

Dr I. S. Uppal (Alternate)
Shri D. R. Narahari

Shri G.S.Jain (Alternate)
Shri H. C. Verma

Shri M. N. Baliga (Alternate)

Engineer-in-Chief's Branch, Army Headquarters
Public Works Department, Government of Uttar

Pradesh
Buildingsand Road Research Laboratory, Chandigarh

Central Building Research Institute (CSIR), Roorkee

Associated Instrument Manufacturers (India) Private
Limited, New Delhi

IS: 4332 (Part IX) -1970

Indian Standard

METHODS OF TEST FOR STABILIZED SOILS

PART IX DETERMINATION OF THE BITUMINOUS

STABILIZER CONTENT OF BITUMEN AND

TAR STABILIZED SOILS

0. FOREWORD

0.1 This Indian Standard (Part IX) was adopted by the Indian Stand-
ards I nstitution on 25 September 1970, after the draft finalized by the
Soil Engineering Sectional Committee had been approved by the Civil
Engineering Division Council.

0.2 Soil stabilization is the alteration of any property of a soil to
improve its engineering performance. There are several methods of
stabilization and these may be broadly on the basis of treatment given
to the soil (for example, dewateringand compaction), process involved
(for example, thermal and electrical) and on additives employed (for
example, asphalt and cement). The choice of a particular method
depends on the characteristics of the problem on hand. For studying in
the laboratory, the methods and effects of stabilization, certain
standard methods of test for the evaluation of properties of stabilized
soils and their analysis are required. The required standards on
methods of test for stabilized soils are being published in parts. This
part (Part IX) lays down the method for the determination of the
bituminous stabilizer content of bitumen and tar stabilized soils.

0.3 1 n the formulation of this standard due weightage has been given

to international co-ordination among the standards and practices

prevailing in different countries in addition to relating it to the

practices in this field in this country.

0.4 This edition 1.1 incorporates Amendment No. 1 (August 1983). Side

bar indicates modification of the text as the result of incorporation of the

amendment.

0.5 In reporting the result of a test or analysis made in accordance
with this standard, if the final value, observed or calculated is to be
rounded off, it shall be done in accordance with I S : 2-1960*.

SECTION A TEST WHERE AMBIENT TEMPERATURE
DOES NOT EXCEED 30°C

1. SCOPE

LlThis Section of the standard (Part IX) covers the determination of
the proportion by weight of bituminous stabilizer present in a stabilized

*Rulesfor rounding off numerical values ( rs/ised '

3

IS: 4332 (Part IX) -1970

soil mixture. It is not suitable for use in climatic conditions where the
ambient temperature exceeds 30°C because of the high rate of
evaporation of the solvent used in the test.

2. GROUPING OF SOIL

2.1 For the purpose of this standard, soils shall be grouped as given
below :

Fine-Grained Soils— Soils containing particles over about 90
percent of which passa 2.36-mm I S Sieve [seel S : 460 (Part I )-1978* ]

Medium-Grained Soils— Soils containing particles over about 90
percent of which pass a 20-mm I S Sieve [seel S : 460 (Part I )-1978* ]

Coarse-Grained Soils— Soils containing particles over about 90
percent of which pass a 40-mm I S Sieve [seel S : 460 (Part I )-1978* ]

3. APPARATUS

3.1 Balance — readable and accurate to 0.001 g.

3.2 Balance— capable of weighing to 250 g, 5 kg and 10 kg, readable
accurate to 0.01 g, 0.5 g and 1 g respectively.

3.3 Wide Mounted Metal Bottle— of approximately 600 ml,
2 500 ml or 7 000 ml capacity (as appropriate) with a tight fitting
rubber stopper.

3.4 Steel Balls — three, of 20 to 25 mm diameter.

3.5 Mechanical Bottle Shaker — preferably giving an end-over -end
shaking action at 60 rev/mi n.

3.6 A 280-ml Carbon Dioxide Flask

3.7 Graduated Measuring Cylinders— 1 000 ml, 500 ml and 250 ml.

3.8 Porous Alumina or Porous Porcelain or Sintered Ware
Filter Candle — approximately 80 mm Iongx30 mm diameter
having a pore size 2-4 )j. (see Fig. 1 ).

3.8.1 The filters are converted into enclosed filters by sealing in, to
within 12 mm of the bottom end, a length of metal or glass tubing
through a cork or metal ring placed in the open top end to act as a
support. The tube is sealed in with a cementing paste composed of
copper oxide power (prepared by direct oxidation of copper wire)
passing the 425-micron IS sieve and retained on 300-micron IS sieve

*Specification for test sieves: Part I Wiredoth test sieves ( second re/ision

IS: 4332 (Part IX) -1970

[see IS: 460 (Part I)- 1978*] mixed with pinospiioric acid, applied
immediately and left for a few hours to dry in air. Other sealing
compound, such as plaster of paris mixed with asbestos fibre may be
used. Alternatively, the filtration assembly may be replaced with a
centrifuge capable of speed up to at least 4 000 rev/mi n when carrying
two or more buckets fitted with centrifuge tubes of 50 ml capacity and
having a diameter not less than 28 cm from tip of the rotating tubes.
The tubes shall bedosed with caps.

3.9 Burette — of 50 ml with a two-way tap, connected to the filtering
assembly in the manner shown in Fig. 2.

PYREX GLASS OR
HETAL TUBE

CEMENT

CORK OR
METAL RING

FROM SOURCE

OF AIR

PRESSURE

POROUS
FILTER

RUBBER STOPPER

METAL
CONTAINER

FILTER

Fig. 1 Assembly OF Filter FOR Fig. 2 Filtering Assembly for

THE Determination of the the Determination of the

Bituminous Stabilizer Content Bituminous Stabilizer Content

OF Stabilized Soils of Stabilized Soils

*Specification for test sieves: Part I Wiredoth test sieves ( second revision

IS: 4332 (Part IX) -1970

3.10 Recovery Apparatus— consisting of a water batin
approximately 15 cm diameter, a manometer, a vacuum reservoir and
a source of vacuum ( see F ig. 3 ).

3.11 Desiccator — containing aniiydrous silica gel.

ft

WATER-

r\L

1

^VACUUM RESERVOIR

Fig. 3 Apparatus for the Determination of Bituminous
Stabilizer Content

4. REAGENTS

4.1 The reagents shall beof recognized analytical reagent quality.

a) Dichloromethane (methylene chloride) — 95 percent collected
between 39 and 40.5°C.

b) Silica gel — powdered, to pass a 75-micron I S Sieve.

5. PREPARATION OF SAMPLE

5.1 The bulk sample shall be reduced by hand into small pieces, and
this may be facilitated if necessary by slight warming. The sample
shall then be quartered successively until representative samples of
the following weights are obtained:

Fine-grained soils 150-200g

Medium-grained soils 1000-1 500 g

Coarse-grained soils 5 000-6 000 g.

IS: 4332 (Part IX) -1970

6. PROCEDURE

6.1 The representative samples of the soil-bituminous stabilizer
mixture, obtained as in 5 containing a known weight of water ( a g )
[which shall be determined in accordance with 15:4332 (Part II)-
1967*] shall beweighed to the nearest 0.01 percent of the weight taken
( W ) and introduced into a wide-mouthed metal bottle of appropriate
capacity. Powdered silica gel shall be added to absorb water, the
quantity being equal to half the weight of water present. I n the case of
fine-grained soils, three steel balls shall then be placed in the bottleto
assist in breaking down the mix. A volume of dichloromethane
measured to the nearest 0.5 percent of the volume taken ( V ml ) shall
be added to the soil in sufficient quantity to obtain a solution
containing 2 to 3 percent of stabilizer. After insertion of the rubber
stopper, the bottle shall be shaken for 30 minutes on the mechanical
shaker in the case of fine-grained soils and for 60 minutes in the case
of medium- and coarse-grained soils.

6.2A portion of the soil stabilizer solution so obtained shall be filtered
through the alumina or porous filter into the burette by the
arrangement shown in Fig. 2, or shall be centrifuged. If the solution is
to be centrifuged, the centrifuge tubes shall be tightly stoppered to
avoid losses due to evaporation. Sufficient quantity of the solution
( V ml ) shall then be transferred by means of a burette into 200 ml
carbon dioxide flask, the weight of which shall be known to the nearest
0.001 g, to give an estimated weight of approximately 0.75-1.25 g of
recovered stabilizer. If the first amount obtained lies outside these
limits another suitably adjusted portion of the solution shall betaken.
The flask shall then be connected to the vacuum line, the manometer
and the reservoir, and placed in a water-bath maintained at 100°C
( see Fig. 3 ). The bulk of the solvent shall be evaporated with the
pressure reduced to 500 ±50 mm Hg, the flask being shaken with a
rotary motion during the course of the evaporation. For complete
removal of solvent one of the following procedures shall be adopted:

a) For Bitumen Emulsions, Tar Emulsions, or Tars Above 42°C
Equiviscous Temperature— In the last stages of evaporation,
when frothing occurs, pressure shall be reduced to 150 mm Hg in
iy2 mi nutes and mai ntai ned at this val uefor a further 372 mi nutes.

b)For Petroleum Oils, Cut-Back Bitumens or Tars of 42°C
Equiviscous Temperature or Below — In the last stages of
evaporation, when frothing occurs, the pressure in the apparatus
shal I be i ncr eased to approxi mately atmospheric and subsequently

*Methods of test for stabilized soils: Part II Determination of moisture content of
stabilized soil mixtures.

IS: 4332 (Part IX) -1970

lowered to 450 mm Hg in iy2 minutes. Tinis pressure sinall be
maintained for a furtiner 372 minutes. Tine reduced pressure may
conveniently be obtained by a water filter-pump; if this is not
available a suitable mechanical vacuum pump may be used, in
which case the following procedures shall be adopted:

The bulk of the methylene chloride shall be distilled off before
connecting the flask to the vacuum line. Toensurethat solvent
vapour does not reach the pump, the flask shall be connected to
the pump through a reservoir consisting of a flask containing
lubricating oil of medium viscosity, followed by a tower
containing activated carbon (1.4 mm to 780 microns). The
procedure subsequently followed shall be as given in 6.2 (a)
and (b).

6.3 The flask shall be removed from the water bath and air admitted
gently to the apparatus. After wiping the flask, the last trace of
dichloromethane shall be removed by means of a gentle air current.
The flask shall then be cooled for 5 minutes in a desiccator and
weighed to the nearest 0.001 g and the weight of recovered stabilizer
( Wi ) determined by difference.

6.4 Soluble Portion of Untreated Soil — A test shall be carried out
under the same conditions on the untreated soil to determine the
quantity ( W2g ) which may be soluble in dichloromethane, and this
shall be deducted from the total soluble content of the stabilized soil.
Unless the soil has been previously stabilized with bitumen, however,
the soluble portion is usually negligible and may be ignored.

6.5 Insoluble Portion of Stabilizer — Bitumens are generally com-
pletely soluble in dichloromethane, but some petroleum stabilizing oils
may contain wax which is insoluble; similarly, certain naturally-
occuring bitumens may contain insoluble mineral matter. Refined tars
also contain a proportion of material insoluble in dichloromethane.

I n such cases allowance shall be made for the insoluble portion in
the calculation of the total stabilizer content. The insoluble matter
shall be determined by dissolving a representative portion of the
stabilizer in dichloromethane and filtering through aGooch or sintered
silica crucible or a filter paper. The percentage of soluble stabilizer
( P ) shall then be calculated.

Note — For general principles of determination of insoluble matter, see IS : 1215-
1978*

*Specification for determination of matter insoluble in toluene ( first re/ision

IS: 4332 (Part IX) -1970

7. CALCULATIONS

7.1 The stabilizer content ( Si ) of tine mixture sinal I be calculated from
the formula:

_100(Wi-W2)V

^1 w;^

W1-W2
1+-

-^ percent

pv

where

Wi =weight of soluble material recovered from aliquot in g ;
W2 =weight of soil soluble in dichloromethanein g;

V =total volume of dichloromethanein ml ;
W =weight of sampletaken in g ;

V =volume of aliquot of dichloromethane digest in ml ;

p =density of recovered stabilizer ( g/cm3 ) (when a sampleof
original stabilizer is not available, an average value of
1.00 for bitumen and 1.175 for tars may be assumed); and

P = percentage of stabilizer soluble in dichloromethane.

7.2The stabilizer content ( S2 ) expressed as a percentage of the
weight of dry soil shall be estimated from the formula:

100 WSi

'^ = 100(W-a)-WSi P"^^^^

where

a = weight of water present in W g of sample-determined as in
I S : 4332 (Part 1 1 )-1967*.

8. REPORTING OF RESULTS

8.1 The results of the test should be suitably recorded.

8.2 The results shall be expressed as the proportion of stabilizer
present to the nearest 0.1 percent.

SECTIONS TEST WHERE AMBIENT
TEMPERATURE EXCEEDS 30°C

9. SCOPE

9.1This Section of the standard (Part IX) covers the determination of
the proportion by weight of bituminous stabilizer present in a
stabilizeJd soil mixture and is suitable for climatic conditions where
temperature exceeds 30°C.

*Methods of test for stabilized soils: Part II Determination of moisture content of
stabilized soil mixtures.

IS: 4332 (Part IX) -1970

10. APPARATUS

10.1 The apparatus shall consist of a hot extractor as shown in Fig. 6
consisting of components as given below:

a) A cylindrical container (Fig. 4) made from brass gauze of about
3 mm which is rested on, or suspended from three pegs inside a
brass or welded iron pot (Fig. 5). Alternatively, the brass gauze
container may rest on a suitable 'stool' standing in the bottom of
the pot. The pot is flanged and fitted with a cover and suitable
jointing gasket. The cover is held in position by swivelling bolts
fitted with wing nuts. The essential features of construction are
indicated in Fig. 4, 5 and 6. It is advantageous to have containers
and pots of more than one size, the size employed being
appropriate to the quantity of material taken for analysis.

b) A graduated receiver conforming to Fig. 7 and an adequate reflux
container. There should be a sufficient flow of cold water to
condense the solvent.

c) A suitable heater, such as an electric plate or a gas ring.

d) Suitable filter paper.

MASS (W WELOEO
IRON COVER

-ih''

SIX OR EIQHT SLOTS EQUALLV
SPACED AROUND CIRCUMFERENCE
TO TAKE SWIVEILINS BOITS,

— F rom 125 mm to 200 mm ^
as appropriate

— F rom 125 mm to 250 mm a

Fig. 4 Cylindrical
Container

A — F rom 125 mm to 225 mm ^ as appropri ate

B — F rom 200 mm to 375 mm ^ as appropriate

All dimensions in millimetres.

Fig. 5 Brass OR Welded Iron Pot

10

IS: 4332 (Part IX) -1970

10 TO 30

BRASS GAUZE
CYLmOER

INTERNAL Dt
OF JET 15-2

All dimensions in millimetres.

Fig. 6 Assembled Apparatus Fig. 7 10 ml Receiver Showing

Alternative Connections to
Distillation Vessel

11. SOLVE NT

11.1 The solvent shall be puretoluole in accordance with IS : 536-1968*.

12. SIZE OF SAMPLE

12.1 The quantities of material taken shall be in accordance with
Table 1.

13. PROCEDURE

13.1 The filter paper shall be dried at 100-120°C, placed in a large
weighing bottle or jar, cooled in a desiccator and weighed. The filter
paper shall then befitted into gauze cylinder to form a complete lining.

*Specifi cation for toluole, industrial ( first re/ision

11

IS: 4332 (Part IX) -1970

Minimum Weight for
each determination

(3)

5 000

3 000

2 000

1000

500

200

TABLE 1 SIZE OF SAMPLE

(Clause 12.1)

Sl Grading of Soil

NO.

(1) (2)

i) More than 25 percent retained on a 40-mm IS sieve

ii) Largely retained on 20-mm but not more than 25 percent
retained on a 40-mm IS sieve

Mi) Largely retained on 12-mm but not more than 25 percent
retai ned on a 25-mm I S si eve

iv) Largely retained on 6.3-mm but not more than 25 percent
retained on a 20-mm IS sieve

v) Largely retained on 3.35-mm but not more than 25 percent
retained on a 6.3-mm IS sieve

vi) Not more than 25 percent retained on a 2.36-mm IS sieve
and not more than 20 percent passing a 75-micron
IS sieve

The sample shall be warmed just sufficiently to facilitate breaking up,
and a representative portion (seeNote) obtained if possible by
quartering, and having the weight as indicated in Table 1, shall be
weighed to the nearest 0.05 percent of the weight taken and
transferred without loss to the filter paper and placed inside the gauze
cylinder. Alternatively, the cylinder and its lining may be placed on
the balance and the material weighed into it. The gauze cylinder shall
then be placed inside the pot and 800-1500 ml of the solvent according
to the size of the extractor, shall be poured over the sample. The cover
shall be bolted on with the dried gasket in position. Water shall be
added to the receiver up to or a little beyond the lowest graduation and
this quantity subsequently deducted from the total volume of water
collected. After fixing the reflux condenser, heat shall be applied to the
pot and so adjusted as to avoid intense local heating, but at the same
time to ensure a steady reflex action of 2 to 5 drops per second falling
from the end of the condenser.

Note —When quantity for the test exceeds the capacity of the apparatus, the
extraction should be carried out in two operations.

13.2 Any water present in the sample will collect in the receiving tube,
while the solvent will fill the tube, flow back over the sample and drain
through the filter paper to the bottom of the pot.

12

IS: 4332 (Part IX) -1970

13.3 If water is removed from the receiver during tine extraction, in
order to obviate fire risl< tine gas flame should be extinguished before
doing this.

13.3.1 Heating shall be continued until extraction is complete and
water ceases to collect in the receiver.

13.4 The washed mineral aggregate, with its container, shall then be
removed and dried to constant weight ( see Note ) at a temperature of
100-120°C. The cylinder and contents shall be cooled in a desiccator
before weighing. I n order to correct for any fine material present in the
solution at the end of the test, the solvent shall be evaporated off, the
residue weighed, and a representative portion of it (between 2 g and
3g) treated with the solvent and filtered through a sintered silica or
glass filtering crucible or filter paper as in the determination of
insoluble matter (see IS : 1215-1978*). In the case of materials
containing natural asphalt or high filler content the whole of the
solution at the end of the test should be filtered or centrifuged.

Note — Material shall be deemed to be at constant weight when the difference
between successive weighings at half-hourly intervals does not exceed 0.05 percent.

14. CALCULATIONS

14.1The soluble binder content S shall be calculated on the dry
sample by means of the following formula:

Wi-(W2+M +kW3/100)

S = 100 percent by weight

Wi-M

where

Wi =weight of undried sample in g,

W2 = weight of recovered aggregate in gauze cylinder in g,

M = weight of water collected in test in g,

k =percent by weight of insoluble matter in residue obtained
on evaporating the solvent, and

W3 = weight in g of residue obtained on evaporating the solvent.

14.2 The total binder content B shall be calculated on the dry sample
by means of the following formula:

B = -y^-^ percent by weight

*Specification for determination of matter insoluble in toluene ( first re/ision

13

IS: 4332 (Part IX) -1970

where

S =soluble binder content as in 14.1, and

T = percent by weigint of bi nder soluble i n the solvent employed.

14.3 Reporting of Results— If the difference between the results
obtained by the duplicate determination exceeds 0.4, they shall be
discarded and the test repeated. If the difference does not exceed 0.4,
the individual values and the mean value shall be reported.

14

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Review of Indian Standards

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amendments or edition by referring to the latest issue of 'BIS Catalogue' and 'Standards : Monthly

Additions'.

This Indian Standard has been developed by Technical Committee : BDC 23

Amendments Issued Since Publication
Amend No. Date of Issue

Amd. No. 1 August 1983

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